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Jan 12, 2021 18:46:29   #
Greereng1 Loc: Northeast ohio
 
So I have a boat with a 2 stroke 9.9 outboard. I have a couple of fish finders and a trolling motor. I have 1 deep cycle marine battery. Thinking of adding second battery. Anyone have thoughts on this or better ideas

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Jan 12, 2021 18:50:35   #
GaryH Loc: Northern Pa.
 
Trolling motor on it's own battery. Everything else on the other. Now that's without knowing size of the boat and whether you have room.

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Jan 12, 2021 18:53:14   #
Greereng1 Loc: Northeast ohio
 
So set each battery separate not in series

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Jan 12, 2021 19:06:04   #
GaryH Loc: Northern Pa.
 
I never have the trolling motor on same circuit as electronics. When the trolling motor is used there is draw. Electronics don't like change in current.

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Jan 12, 2021 19:06:59   #
Greereng1 Loc: Northeast ohio
 
Ok thanks for the tip

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Jan 12, 2021 19:18:12   #
GaryH Loc: Northern Pa.
 
You should be seeing interference on the FF when you run your trolling motor. If not your a lucky man. I have three batteries for the TM and a separate one for outboard/electronics.

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Jan 12, 2021 19:45:31   #
Greereng1 Loc: Northeast ohio
 
No never really had an issue but to be honest my ff were not as good as some of the ones out there but I do have a newer one I will be adding this year and that could be an issue

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Jan 12, 2021 19:58:01   #
Robert J Samples Loc: Houston TX
 
Listen to the experts~! Just Sayin...RJS

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Jan 12, 2021 20:26:51   #
FixorFish Loc: SW Oregon
 
Your finder draws next to nothing, compared a trolling motor. I may be mistaken, but I believe that your finder doesn't need a deep cycle, either. My finder runs on "C" cell flashlight batteries (Fishin' Buddy), but my friend runs his Garmin off a rather tiny 12v (3"x4"x6" ??) that he got at BPS, a pair and a charger were less than $100/all, I believe he said. Don't recall whether they were deep cycle or not.
I use Duracell AGM Deep cycle that are 35amp/hr, the "Jazzy Scooter" type @ "Batteries Plus" for~$90. 23lbs and 5 1/2"x6 1/2"x8". Use 2 in the lake boat, go all day using a 55lb thrust, no prob... barely get into the second, if at all, if I use the 34lb.
I have to concur that using separate motor and finder batteries would be wise.

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Jan 12, 2021 20:47:58   #
Fredfish Loc: Prospect CT.
 
Greereng1 wrote:
So I have a boat with a 2 stroke 9.9 outboard. I have a couple of fish finders and a trolling motor. I have 1 deep cycle marine battery. Thinking of adding second battery. Anyone have thoughts on this or better ideas


You should run the trolling motor on a separate battery to avoid interference. Do NOT hook batteries in series unless you have a 24volt trolling motor. And you will fry your fishfinder with 24volts. Fix is correct, fishfinders don't draw much,and will run all day on a smaller battery. They sell portable battery packs for using fishfinder for Ice fishing. That's all you should need.

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Jan 12, 2021 20:49:06   #
Greereng1 Loc: Northeast ohio
 
Great info thanks all for your tips

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Jan 12, 2021 21:18:10   #
DozerDave Loc: Port Orchard Wa.
 
Greereng1 wrote:
So I have a boat with a 2 stroke 9.9 outboard. I have a couple of fish finders and a trolling motor. I have 1 deep cycle marine battery. Thinking of adding second battery. Anyone have thoughts on this or better ideas


I run two batteries with my 18’ aluminum V bottom. I put new ones in this year and I can run 6 to 7 hrs. and only use 50%. You’ll be happy you did. 🐟on

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Jan 12, 2021 21:26:19   #
Able Man Loc: North Coast (Cleveland, Ohio)
 
You can put as many as you have room for, in parallel. (+2+; -2-)

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Jan 12, 2021 21:26:28   #
Jeremy Loc: Oregon
 
I would put an isolator on main battery between it and the trolling deep cycle. Whenever main gas engine is running it will charge the deep cycle trolling battery. when engine is off it will be disconnected automatically. That will also help the electric noise. Solar Panels will also charge batteries. I have dreamt of having few large solar panels as a canopy and charging system.

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Jan 12, 2021 21:33:45   #
Fredfish Loc: Prospect CT.
 
Jeremy wrote:
I would put an isolator on main battery between it and the trolling deep cycle. Whenever main gas engine is running it will charge the deep cycle trolling battery. when engine is off it will be disconnected automatically. That will also help the electric noise. Solar Panels will also charge batteries. I have dreamt of having few large solar panels as a canopy and charging system.


You would be lucky to get 1amp out of a 9.9hp, if it even has a charging coil in it. With that low power for a main motor, you want as little weight in the boat as possible.

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